CN115174001B - Application method of DMRS symbol idle RE in NR5G, storage medium and electronic equipment - Google Patents
Application method of DMRS symbol idle RE in NR5G, storage medium and electronic equipment Download PDFInfo
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
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Abstract
The invention discloses a method for using idle RE of a DMRS symbol in NR5G, a storage medium and electronic equipment, and relates to the technical field of communication, when the Type of the DMRS is Type1 and the configuration value of Number of DM-RS CDM groups withoutdata is 2, the idle RE in the DMRS symbol has two using methods: firstly, when the current uplink slot user only transmits PUSCH data, idle RE in a DMRS symbol is utilized to calculate air interface noise power, the DMRS is not required to calculate a channel response value, and the calculation complexity is reduced; and secondly, idle RE resources on OFDM symbols where the DMRS is positioned are utilized to transmit HARQ-ACK channel associated information, RE resources of a PUSCH are not required to be occupied, the RE resources occupied after the current HARQ-ACK coding are not required to be calculated, the calculation complexity is reduced, and the HARQ-ACK channel associated information has low requirement on SNR due to the adoption of low-order MCS, so that the demodulation performance of the HARQ-ACK channel associated information is further enhanced.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method for using a DMRS symbol idle RE in NR 5G.
Background
In NR-5G (New Radio 5 Generation), the UE receives an uplink scheduling grant issued by the base station, and transmits a PUSCH (Physical uplink shared channel, uplink shared physical channel) signal on a corresponding time-frequency resource, where the PUSCH signal includes DATA and a reference signal (DMRS, demodulation reference signal).
The DMRS is used as a reference signal, the base station locally generates the same DMRS signal according to the high-level resource allocation information, and the DMRS signal local to the base station and the DMRS signal in the PUSCH transmitted by the received UE are processed to a certain extent, so that demodulation of PUSCH data can be completed. In the OFDM symbol where the DMRS is located, when the DMRS type1, number of DM-RS CDM groups without data is configured as 2, the DMRS is mapped on the frequency domain by spacing 1 subcarrier, that is, only 6 REs (Resource elements) in 1 RB (Resource Block) transmit the DMRS, and half of the REs are in an idle state and do not transmit any data, so that Resource waste is caused.
In addition, the conventional noise power calculation method is obtained by subtracting the estimated signal from the received signal, i.e
Wherein N is sc The method comprises the steps that the number of REs where the DMRS in an OFDM symbol where the DMRS in a user PUSCH is located is calculated, Y (K) is a DMRS signal, H (K) is an estimated channel response value, and X (K) is a local DMRS signal.
The traditional noise power calculation method needs to use DMRS to carry out channel estimation, calculate a channel response value H (k), wherein k is an RE resource index of a symbol where the DMRS is located, then multiply a local DMRS sequence by using a channel corresponding value, subtract a multiplication result and a received DMRS signal to obtain noise, and calculate the noise power to obtain the noise power. The traditional noise power calculation method is complex and has high requirement on the calculation capacity of the processor.
At present, in an OFDM symbol where the DMRS is located, when the type1 of the DMRS and the number of DM-RS CDM groups without data are configured to be 2, idle RE is not adopted to bear the HARQ-ACK information of the channel, so that the calculation complexity is high, and the demodulation success rate of the HARQ-ACK of the channel is not high enough.
Disclosure of Invention
The invention provides a method for using a DMRS symbol idle RE in NR5G, a storage medium and electronic equipment, which are used for reducing the computational complexity of air interface noise and enhancing the demodulation performance and resource utilization rate of a PUSCH (physical uplink shared channel) HARQ-ACK.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a method for using DMRS symbol idle REs in NR5G, including:
when the DMRS Type in the high-level resource configuration is Type1 and the configuration value of Number of DM-RS CDM groups without data is 2, extracting idle RE in symbol data where the user DMRS is located, and then calculating air interface noise power by using the idle RE, or modulating channel associated HARQ-ACK information by adopting a QPSK low-order modulation mode, and processing the channel associated HARQ-ACK information by using the idle RE;
calculating the air interface noise power P noise The formula of (2) is
Wherein X is noise (k) Frequency domain data representing idle REs, k being the index of idle REs, N sc' The number of idle REs in an OFDM symbol where the DMRS in the frequency domain data of the user PUSCH is located;
the processing flow of the channel associated HARQ-ACK information comprises the following steps:
s1, performing channel estimation on a DMRS signal in symbol data where the DMRS is located and a base sequence of a local DMRS to obtain a channel response value H;
s2, balancing symbol data where the DMRS is located by using a channel response value H, and extracting balanced data in idle RE from a balanced result;
s3, merging the balanced data in the idle RE to obtain merging result data;
s4, performing LLR soft bit demodulation on the combined result data to obtain bit information of QPSK;
s5, decoding the bit information of QPSK to obtain HARQ-ACK information.
In a preferred embodiment of the present invention, when the UE has both uplink and downlink services, the UE multiplexes HARQ-ACK information through the PUSCH physical channel, and performs the processing of the channel-associated HARQ-ACK information using the DMRS symbol idle REs; when the current Slot has only the PUSCH data of the UE and no HARQ-ACK information is multiplexed, the idle RE of the DMRS symbol is utilized to calculate the air interface noise power.
In a preferred embodiment of the present invention, symbol data where the DMRS of the user is located is extracted from frequency domain data of the PUSCH of the user.
In a preferred embodiment of the present invention, after receiving PUSCH time domain data, the receiver performs preprocessing on PUSCH time domain data according to high-level resource allocation, and extracts frequency domain data of a user PUSCH.
In a preferred embodiment of the present invention, the method for preprocessing PUSCH time domain data includes decp, FFT and demapping.
In a preferred embodiment of the present invention, the HARQ-ACK information that needs to be carried by the idle REs is 1bit or 2 bits in size.
In a preferred embodiment of the present invention, the formula for merging the equalization data in idle REs is as follows:
wherein Z (k) is the equalization data of idle RE, Z' is the merging result, N sc' The number of idle REs in the OFDM symbol where the DMRS in the user PUSCH is located.
In a second aspect, the invention provides a computer-readable storage medium storing computer instructions that, when executed by one or more processors, cause the one or more processors to perform the method of the first aspect.
In a third aspect, the present invention provides an electronic device, including:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
1) When the DMRS Type is Type1, the configuration value of the Number of DM-RS CDM groups without data is 2, and the current uplink slot user only transmits PUSCH data, idle RE in the DMRS symbol is utilized to calculate air interface noise power, the DMRS is not required to be utilized to carry out channel estimation to calculate a channel corresponding value, and the channel corresponding value and the received DMRS symbol are utilized to complete noise calculation, so that the complexity of noise calculation is reduced;
2) When the DMRS Type is Type1 and the configuration value of the Number of DM-RS CDM groups without data is 2, the idle RE on the OFDM symbol where the DMRS is located is utilized to transmit the HARQ-ACK channel associated information, and RE resources of the PUSCH are not required to be occupied, so that the demodulation code rate of the PUSCH is not increased. And the HARQ-ACK is placed on the RE of the idle DMRS, so that the system does not need to calculate RE resources of the PUSCH data symbols occupied by the current HARQ-ACK after coding, and the calculation complexity is reduced. Because the HARQ-ACK coding adopts low-order MCS, the SNR requirement is not high, even if the PUSCH adopts high-order MCS modulation, the reliability of correct demodulation of the following signal HARQ-ACK can be ensured under the condition of low SINR, thereby further enhancing the HARQ-ACK following information demodulation performance.
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a DMRS signal profile in 1 DMRS symbol when the DMRS Type is Type1 and the Number of DM-RS CDM groups without data is configured to be 2;
FIG. 2 is a schematic diagram of the noise measurement process flow of the present invention;
fig. 3 is a schematic diagram of a channel associated HARQ-ACK information processing flow of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
In NR5G communication, after receiving PUSCH time domain data, a receiver extracts frequency domain data of a user PUSCH through CP removal, FFT and demapping. And then extracting the number of symbols where the user DMRS is located from the frequency domain data of the user PUSCH according to the high-level resource configuration.
At this time, the DMRS type can be known. The DMRS Type is Type1, the Number of DM-RS CDM groups without data (CDM group Number of DMRS) is configured as 2, and 6 REs in each RB in the symbol where the DMRS is located currently do not release any data, as shown in fig. 1, that is, idle REs appear.
In the above cases, as shown in fig. 2 and fig. 3, the present invention provides a method for using DMRS symbol idle REs in NR5G, which is specifically divided into two cases.
First case:
the current slot has only PUSCH data of the user, but no HARQ-ACK information multiplexing, at this time, the idle RE power in the symbol data where the DMRS of the user is located is calculated, and the power value may be regarded as an air interface noise power value, that is, the current subband noise is measured by the idle RE resource in the symbol data where the DMRS is located,
by X noise (k) Frequency domain data representing idle RE, k is index of idle RE, and air interface noise power P is calculated noise The formula of (2) is as follows:
wherein X is noise (k) Frequency domain data representing idle REs, k being the index of idle REs, N sc' And the number of idle REs in an OFDM symbol where the DMRS in the frequency domain data of the user PUSCH is located.
By adopting the method to calculate the air interface noise power, the DMRS does not need to be used for calculating the channel response value H (k), wherein k is the index of the frequency domain resource in the OFDM symbol where the DMRS is positioned. It can be seen that when the DMRS Type is Type1 and the configuration value of Number of DM-RS CDM groups without data is 2, when the current uplink slot user only transmits PUSCH data, i.e. no random UCI (Uplink Control Information, uplink control indication information) is multiplexed, the idle RE in the OFDM symbol where the idle DMRS is located is used to calculate noise, so that the complexity of calculation is reduced.
Second case:
the UE has both uplink PUSCH data service and downlink service, and the UE multiplexes HARQ-ACK information through a PUSCH physical channel, namely, the PUSCH has both uplink data sent by the UE and HARQ-ACK information of a downlink which needs to be fed back by the UE.
Since 3gpp protocol 38.212 describes that when the UE transmits data and HARQ-ACK information (PUSCH associated information) using a PUSCH channel, HARQ-ACK bit information is ultimately modulated in a modulation manner of PUSCH data, and occupies PUSCH data resources. If PUSCH is modulated with 64QAM, correct demodulation is required when SNR (signal to noise ratio) is large, and if SNR is low, risk of error decoding of the channel-associated HARQ-ACK information increases.
Therefore, the invention uses idle RE to process HARQ-ACK information of the channel, namely uses idle RE in symbol data of DMRS to bear 1bit or 2bit HARQ-ACK information, and the modulation mode of the HARQ-ACK information is fixed as QPSK, which comprises the following steps:
1) And carrying out channel estimation on the DMRS signal in the symbol data where the DMRS is located and a base sequence of the local DMRS to obtain a channel response value H.
2) And equalizing symbol data where the DMRS is positioned by using a channel response value H, and extracting equalized data in idle RE from an equalized result.
3) And merging the balanced data in the idle RE to obtain merging result data, wherein the merging formula is as follows:
wherein Z (k) is the equalization data of idle RE, Z' is the merging result, N sc' The number of idle REs in the OFDM symbol where the DMRS in the user PUSCH is located.
4) And carrying out LLR (maximum likelihood logarithmic ratio) soft bit demodulation on the combined result data to obtain bit information of QPSK.
5) And decoding bit information of QPSK to obtain HARQ-ACK information.
E.g., 1bit HARQ-ACK information is transmitted at the transmitting end, where '00' indicates transmission of 1bit NACK, '11' indicates transmission of 1bit ACK,
in accordance with the description of QPSK in 3gpp 38.211 5.1.3,
the constellation point map is:
where b (2 i), b (2i+1) is bit information to be modulated. If b (2 i), b (2i+1) is '00', the UE is considered to have sent a 1bit NACK. If b (2 i), b (2i+1) is '11', the UE is considered to have sent a 1-bit ACK.
E.g., transmitting 2-bit HARQ-ACK information at the transmitting end, wherein '00' represents 2-bit NACK, 01' represents NACK ACK, 11' represents ACK, and 10' represents ACK NACK.
If b (2 i), b (2i+1) is '00', the UE is considered to transmit 2bit information as NACK. If b (2 i), b (2i+1) is '11', the UE is considered to transmit 2bit information as ACK. If b (2 i), b (2i+1) is '01', the UE is considered to transmit 2bit information as NACK ACK. If b (2 i), b (2i+1) is '10', the UE is considered to transmit 2bit information as ACK NACK.
It can be seen that, in this embodiment, idle REs in symbol data where the DMRS is located are used to carry 1bit or 2bit HARQ-ACK information, and the modulation mode of the HARQ-ACK information is fixed to QPSK, so that the demodulation success rate of the associated HARQ-ACK can be further enhanced.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for using DMRS symbol idle REs in NR5G, comprising:
when the DMRS Type in the high-level resource configuration is Type1 and the configuration value of Number of DM-RS CDM groups without data is 2, extracting idle RE in symbol data where the user DMRS is located, and then calculating air interface noise power by using the idle RE, or modulating channel associated HARQ-ACK information by adopting a QPSK low-order modulation mode, and processing the channel associated HARQ-ACK information by using the idle RE;
calculating the air interface noise power P noise The formula of (2) is
Wherein X is noise (k) Frequency domain data representing idle REs, k being the index of idle REs, N sc' The number of idle REs in an OFDM symbol where the DMRS in the frequency domain data of the user PUSCH is located;
the processing flow of the channel associated HARQ-ACK information comprises the following steps:
s1, performing channel estimation on a DMRS signal in symbol data where the DMRS is located and a base sequence of a local DMRS to obtain a channel response value H;
s2, balancing symbol data where the DMRS is located by using a channel response value H, and extracting balanced data in idle RE from a balanced result;
s3, merging the balanced data in the idle RE to obtain merging result data;
s4, performing LLR soft bit demodulation on the combined result data to obtain bit information of QPSK;
s5, decoding the bit information of QPSK to obtain HARQ-ACK information.
2. The method for using DMRS symbol idle REs in NR5G according to claim 1, wherein when the UE has both uplink traffic and downlink traffic, the UE multiplexes HARQ-ACK information through a PUSCH physical channel, and performs channel HARQ-ACK information processing using the DMRS symbol idle REs; when the current Slot has only the PUSCH data of the UE and no HARQ-ACK information is multiplexed, the idle RE of the DMRS symbol is utilized to calculate the air interface noise power.
3. The method for using DMRS symbol idle REs in NR5G according to claim 1, wherein symbol data where a user DMRS is located is extracted from frequency domain data of a user PUSCH.
4. The method for using DMRS symbol idle REs in NR5G according to claim 3, wherein after receiving PUSCH time domain data, the receiver performs preprocessing on PUSCH time domain data according to higher layer resource configuration, and extracts frequency domain data of a user PUSCH.
5. The method for using DMRS symbol idle REs in NR5G according to claim 4, wherein the method for preprocessing PUSCH time domain data includes decp, FFT, and demapping.
6. The method for using DMRS symbol idle REs in NR5G according to claim 1, wherein the HARQ-ACK information that needs to be carried by the idle REs is 1bit or 2 bits.
7. The method for using DMRS symbol idle REs in NR5G according to claim 6, wherein the formula for combining equalization data in idle REs is as follows:
wherein Z (k) is the equalization data of idle RE, Z' is the merging result, N sc' The number of idle REs in the OFDM symbol where the DMRS in the user PUSCH is located.
8. A computer-readable storage medium storing computer instructions that, when executed by one or more processors, cause the one or more processors to perform the method recited in any of claims 1-7.
9. An electronic device, comprising:
at least one processor; the method comprises the steps of,
a memory communicatively coupled to the at least one processor; wherein,,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-7.
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| Title |
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| 《R1-1805958 Remaining issues on DMRS design》;Huawei, HiSilicon;《3GPP TSG RAN WG1 Meeting #93》;全文 * |
| 《R1-1903707 Offline discussions for enhanced configured grant PUSCH transmissions》;NTT DOCOMO, INC.;《3GPP TSG RAN WG1 Meeting #96》;全文 * |
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